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    Polyarylates having improved hydrolytic stability
    32.
    发明授权
    Polyarylates having improved hydrolytic stability 失效
    具有改善的水解稳定性的聚芳酯

    公开(公告)号：US5036150A

    公开(公告)日：1991-07-30

    申请号：US512125

    申请日：1990-04-20

    Applicant: James H. Kawakami ,  James E. Harris ,  Louis M. Maresca ,  Lloyd M. Robeson

    Inventor： James H. Kawakami ,  James E. Harris ,  Louis M. Maresca ,  Lloyd M. Robeson

    IPC: C08G63/193 ,  C08G63/688

    CPC classification number: C08G63/193 ,  C08G63/6886

    Abstract: This invention relates to moldable polyarylates and in particular to moldable polyarylate compositions which have repeating units derived from bis-(3,5-dimethyl-4-hydroxyphenyl) sulfone (TMBS), optionally a dihydric phenol such as 2,2-bis-(4-hydroxyphenyl)-propane (Bisphenol A) and a mixture of isophthalic acid and terephthalic acid or derivatives thereof. Such polyarylates exhibit improved hydrolytic stability.

    Abstract translation: 本发明涉及可成型的多芳基化合物，特别涉及具有衍生自双（3,5-二甲基-4-羟基苯基）砜（TMBS），任选的二元酚如2,2-双 - （ 4-羟基苯基） - 丙烷（双酚A）和间苯二甲酸和对苯二甲酸或其衍生物的混合物。 这种多芳基化合物表现出改善的水解稳定性。

    Blends of poly(propylene carbonate) and poly(methyl methacrylate) and their use in decomposition molding
    34.
    发明授权
    Blends of poly(propylene carbonate) and poly(methyl methacrylate) and their use in decomposition molding 失效
    聚（碳酸丙烯酯）和聚（甲基丙烯酸甲酯）的共混物及其在分解成型中的应用

    公开(公告)号：US4946884A

    公开(公告)日：1990-08-07

    申请号：US365277

    申请日：1989-06-12

    Applicant: Jeffrey A. Kuphal ,  Lloyd M. Robeson ,  James J. Weber

    Inventor： Jeffrey A. Kuphal ,  Lloyd M. Robeson ,  James J. Weber

    IPC: B22C7/02 ,  C08J9/00

    CPC classification number: C08J9/0061 ,  B22C7/023 ,  C08L69/00 ,  C08J2333/12 ,  C08J2369/00 ,  C08J2433/00 ,  C08J2469/00

    Abstract: Compositions useful in decomposition molding procedures such as destructive foam casting or ceramic or metallic powder sintering are provided by blends of polymers having greater than 50 weight percent propylene carbonate units and polymers having greater than 50 weight percent methyl methacrylate units. Such blends exhibit an unexpectedly even decomposition profile over the range of temperatures at which their constituent polymers each decompose relatively rapidly. The controlled decomposition rate reduces problems in destructive foam casting and ceramic or metallic powder molding caused by sudden release of gases by the foam pattern or the polymer binder. Preferred blends contain 35 to 65 weight percent poly(methyl methacrylate) and 65 to 35 weight percent poly(propylene carbonate), and very even decomposition behavior is exhibited by blends of 35 to 45 weight percent poly(methyl methacrylate) and 65 to 55 weight percent poly(propylene carbonate).

    Abstract translation: 通过具有大于50重量％的碳酸丙烯酯单元的聚合物和具有大于50重量％的甲基丙烯酸甲酯单元的聚合物的共混物来提供可用于分解模塑程序如破坏性泡沫浇铸或陶瓷或金属粉末烧结的组合物。 这些共混物在它们的组成聚合物各自相对快速分解的温度范围内显示出意想不到的均匀分解曲线。 受控的分解速率降低了由泡沫图案或聚合物粘合剂突然释放出来的破坏性泡沫铸造和陶瓷或金属粉末成型中的问题。 优选的共混物包含35至65重量％的聚（甲基丙烯酸甲酯）和65至35重量％的聚（碳酸亚丙酯），并且通过35至45重量％的聚（甲基丙烯酸甲酯）和65至55重量份的共混物显示非常均匀的分解行为 百分比聚（碳酸亚丙酯）。

    Method for foaming high temperature polymers using poly(alkylene carbonates) as foaming agents
    35.
    发明授权
    Method for foaming high temperature polymers using poly(alkylene carbonates) as foaming agents 失效
    使用聚（亚烷基碳酸酯）作为发泡剂发泡高温聚合物的方法

    公开(公告)号：US4940733A

    公开(公告)日：1990-07-10

    申请号：US442107

    申请日：1989-11-28

    Applicant: Jeffrey A. Kuphal ,  Lloyd M. Robeson ,  Joseph G. Santangelo

    Inventor： Jeffrey A. Kuphal ,  Lloyd M. Robeson ,  Joseph G. Santangelo

    IPC: C08J9/06 ,  C08J9/08

    CPC classification number: C08J9/08 ,  C08J9/06

    Abstract: A process for producing cellular foamed articles from high temperature engineering polymers wherein polymeric blowing agents are utilized to expand the polymers. The process comprises mixing a first polymer capable of being foamed with a second polymer comprising at least one poly(alkylene carbonate) to provide a polymer blend; heating the polymer blend to a temperature sufficient to melt the polymer to be foamed and to decompose the second polymer to form gas inclusions within the first polymer; expanding the melted first polymer containing the gas inclusions to form a foamed article; and cooling the foamed article to a temperature below the melting or softening point of the foamed article. Polymers which may be foamed according to the process include those polymers which can tolerate processing temperatures in excess of 260.degree. C. Suitable poly(alkylene carbonate) foaming agents include poly(propylene carbonate), blends of two or more poly(alkylene carbonates) and copolymers and terpolymers formed by polymerizing two or more oxirane compounds in the presence of carbon dioxide.

    Abstract translation: 一种由高温工程聚合物制备多孔发泡制品的方法，其中使用聚合发泡剂来膨胀聚合物。 该方法包括将能够发泡的第一聚合物与包含至少一种聚（碳酸亚烷基酯）的第二聚合物混合以提供聚合物共混物; 将聚合物共混物加热到足以熔化要发泡的聚合物的温度并分解第二聚合物以在第一聚合物内形成气体夹杂物; 膨胀含有气体夹杂物的熔融的第一聚合物以形成发泡制品; 并将发泡制品冷却至低于泡沫制品的熔化或软化点的温度。 根据该方法可以发泡的聚合物包括能够耐受超过260℃的加工温度的那些聚合物。合适的聚（碳酸亚烷基酯）发泡剂包括聚（碳酸亚丙酯），两种或多种聚（碳酸亚烷基酯）和 通过在二氧化碳存在下聚合两种或多种环氧乙烷化合物形成的共聚物和三元共聚物。

    Miscible blends of poly(aryl ether sulfones)
    37.
    发明授权
    Miscible blends of poly(aryl ether sulfones) 失效
    聚（芳基醚砜）的混溶混合物

    公开(公告)号：US4804723A

    公开(公告)日：1989-02-14

    申请号：US101260

    申请日：1987-09-25

    Applicant: James E. Harris ,  Lloyd M. Robeson

    Inventor： James E. Harris ,  Lloyd M. Robeson

    IPC: C08L71/00 ,  C08L81/06 ,  H05K1/03 ,  C08F283/00

    CPC classification number: C08L71/00 ,  C08L81/06 ,  H05K1/0333

    Abstract: Described herein are miscible blends of select poly(aryl ether sulfones). These blends are suitable for printed wiring board substrates, flexible printed circuit boards, electrical connectors and fabricated articles requiring high heat and chemical resistance, and good dimensional and hydrolytic stability.

    Abstract translation: 本文描述的是选择性聚（芳基醚砜）的混溶混合物。 这些共混物适用于印刷线路板基板，柔性印刷电路板，电连接器和需要高耐热和耐化学性的制造制品以及良好的尺寸和水解稳定性。

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